One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18)(19,23)(20,28)(21,25)(22,26)(24,27)(29,31)(30,32) involution — undirected(2,5)(6,8)(9,10,12,13)(11,14,15,16)(17,19,22,21)(18,23,26,25)(20,27,29,30)(24,31,32,28)(1,3,4,7)(2,6,5,8)(10,13)(11,15)(17,20,22,29)(18,24,26,32)(19,27,21,30)(23,31,25,28)(9,11)(10,14)(12,15)(13,16)(17,19,22,21)(18,25,26,23)(20,27,29,30)(24,28,32,31)(10,13)(11,15)(18,26)(23,25)(24,32)(28,31) involution — undirectedA 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.