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