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)(19,20)(21,24)(22,31)(23,26)(25,27)(28,30)(29,32) involution — undirected(1,2,4,5)(3,7,8,6)(9,10)(11,15)(12,14)(13,16)(17,19)(18,20)(21,27)(22,29)(23,28)(24,25)(26,30)(31,32)(9,11)(10,13)(12,16)(14,15)(17,20,27,32,23,30,22,24)(18,21,31,28,26,29,25,19)(1,3,4,8)(2,6,5,7)(11,16)(13,15)(17,21,23,29)(18,24,26,32)(19,27,28,22)(20,25,30,31)(10,14)(13,15)(19,28)(20,30)(21,29)(24,32) 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.