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