I suspect that you needed to have that graft redone as the site must have become contaminated with saliva and germs. Let me know how it turned out, please.
Sounds like the area has certainly become infected by saliva and all the germs contained in the mouth. You will probably need to have the area regrafted. Go see your dentist as soon as possible.
You may have gotten some food or debris trapped in the gums causing the swelling. If you aren't having pain in the bone, the socket and extraction sites are most likely fine. You could have a stitch still in there trapping plaque and causing inflammation. I would suggest you see your dentist to...