Where can i find a diagram of toilet plumbing from roof to sewer?

Are you dealing with a plumbing emergency like a leaking water heater, a sewer that's backing up, burst pipes, blocked drains, an overflowing toilet, or a washing machine that has a water supply line that's leaking? Sounds like an urgent situation. You would be best to call a plumber asap.
For more info this might help: https://3pointsplumbing.ca/services/leaks.html

Your vent stack may be clogged. The pipe that goes up to the roof. Let's air into sewer pipes when you flush. A birds nest or something can do it.

It is possible that the vent pipe behind the toilet is clogged (or was not installed properly). Some bathrooms are set up with one shared vent pipe, and a clog in one of the lines leading to it can cause similar problems.
The vent pipe in each bathroom does 2 things:
1: it lets the sewer gas go past the bathroom and up out the roof so you don't get sewer gas in the house.
2: It breaks the siphon as water goes from fixtures down to the big sewer pipes in the house. If it isn't working for a sink, it's not much of a problem because air gets mixed in with the water as it does down the sink, and this breaks the siphon. But in a toilet, it jsut keeps pulling water down the pipe until the water level in the toilet gets low enough to let air into the pipe, breaking the siphon.

It's not an easy problem to fix and often involves removing walls to get at pipes.
A plumber can bring a snake tool and try clearing the pipes from below or from the roof, and might even be able to bring a steerable snake that lets him control how it goes through the pipe.

It could be a venting issue. Check the roof vent for the plumbing system. Perhaps clogged with leaves or other debris causing a blockage in the vent line. You can use a hose up to the roof and flush out the vent line. Another problem may be calcium buildup. CLR , a product available at most hardware and grocery stores will dissolve mineral buildups.

Suppose you plugged the drain of the sink and filled the basin with water, then removed the plug. I must think that only after the basin empties you would get the sewer smell, and the smell would persist until you slowly ran some more water. If you try this, and this is the result, then the problem is that the sewer vent (that is supposed to prevent the water in the trap under the sink from being sucked down the drain) is not working right. If this is a new problem then you may be able to clear what is probably a blocked vent pipe. If this bathroom has always had this problem, then you have a poorly designed or executed vent pipe setup that you can only fix it with some surgery to your plumbing. However, to clean the vent you can try pouring a good bit of drain cleaner down the vent pipe on the roof, followed by water. But because there may be several vent pipes sharing the same vent stack out the roof, the drain cleaner may not get to your blockage and may simply go down a different path. Good luck.

something is probably in the trap of the stool or the sewer vent that is on the roof is plugged up.

It sounds like a vent problem.
On top of each house is a vent stack.
There should be a vent stack above each toilet, and above kitchen sink.
Look for pipes sticking out of roof.
These pipes are open to the sewer line.
When you run a column of water down a drain, the vent stack lets air flow in front of and behind the column of water.
This air flow prevents the gurgling sound.
The gurgling sound is the drain water pushing air in front of it because of a clogged vent.
If you have a two story house, there are vents that run between floors to prevent the air flow from gurgling or bubbling sewer air into each drain as water column moves down pipe.

http://www.bradyinspects.com/plumbing-vents.html
http://chestofbooks.com/home-improvement/construction/plumbing/Standard-Practical/Venting-Part-3.html

Look for bird nest over vent pipe on top of house.
Run a snake down into pipe from roof and see if the is a stoppage.
You many need to call plumber to track down each vent and the cause.
For example if there are quick-vents installed inside a wall and the quick vent is no longer working.

You can also take advantage of fixya phone support.
Fixya expert will walk you through the steps for a price.

jajoy,

Did you connect the sanitary pipe stack to the sewer line that takes away the flushed effluent? Check to see that the pipe is connected, not leaking sewer gas, not plugged up with an animal carcass, and that the pipe extends through your roof three feet past the roof line (keeps smell out of house).

Are your wast water pipes in your house vented through the roof? If they are maybe the vent pipe is clogged. At my father in-laws house the pipes are not vented through the roof like their supposed to be to vent sewer gas. they are not vented at all. Every time you flush it sounds like someone is downs stairs screaming. Something to do with air/ suction in the pipes.