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