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