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