For an introduction, see "Create standard statistical graphs from SAS/IML".
For a video overview, see "What's new in SAS/IML 13.1"
For details, see the documentation chapter "Statistical Graphics" in the SAS/IML User's Guide.
If there is a particular graph that you want to use, go to The DO Loop blog and search for that graph. For example, search for "call scatter" to see examples of scatter plots or "Call histogram" to see examples of histograms.