One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(10,13)(11,14)(15,16)(17,18)(19,27)(20,23)(21,25)(22,26)(24,30)(28,31)(29,32) involution — undirected(2,5)(6,8)(9,10,12,13)(11,14,15,16)(19,28)(24,32)(27,31)(29,30)(1,3,4,7)(2,6,5,8)(9,11,12,15)(10,14,13,16)(18,23)(20,21)(24,31)(25,26)(27,32)(29,30)(17,19,22,28)(18,24,26,32)(20,30,21,29)(23,31,25,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.