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