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