The following figures from the International Antiviral Society USA (IAS-USA) show mutations for each drug and illustrate cross resistance between drugs in each class.
The IAS-USA website includes free download of the latest guidelines to HIV drug resistance published in 2013 in Topics in HIV Medicine. This is the source for the the following tables. https://www.iasusa.org/sites/default/files/tam/21-1-6.pdf (PDF)
Please check the IAS-USA site for updates to these resources. Please refer to the full guidelines for the notes and references.