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