I must say that it is must be much easier when you live alone. When you live alone you can simply haul them to the trash can outside assuming you live in a house. If you were to live in an apartment alone, I imagine it would be the same process but with a black bag. The only thing you would have to be worried about is if you were to pass someone on your way to the dumpster. Now as for the scenario where you live with either one or more room-mates in an apartment, that would truly be nerve wrecking for me, but I think you could do something similar to what I do assuming they do not enter your room ...ever...
Seeing as I still live at home with my parents, what I have to do is place them into smell proof bags and then place those into an odor locking pail that I keep inside my closet. Then the day before the trash is to be picked up I haul the trash out to the bin. The only downside to this is that you have to incur the one time cost of the pail and continuously re-stock on the odor neutralizing bags.
Assuming your used diapers are only wet, the smell never really gets that noticeable. I usually try to cycle them out as fast as possible to avoid any possibility of smell. Fortunately I have never had a problem in the past since no one enters my room (as far as I know). My current process tends to hold the smell fairly well. On the seldom occasion where I a sleight smell becomes noticeable. I usually plug in an electric air-freshener and if it is really bad, I have in the past tried dryer sheets but I am not certain of how well there work because tossing the trash becomes my utmost concern.
This is one of the things that scares me the most when I do eventually move out after I am finished with college.