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