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)(20,24)(25,31)(28,32)(1,3)(2,5)(4,6)(7,8)(9,10)(11,16)(12,14)(13,15)(18,23)(19,26)(25,31)(27,29) involution — undirected(1,4,7,5)(2,3,6,8)(9,11,13,14)(10,12,15,16)(17,18,22,23)(19,24,26,20)(21,25,30,31)(27,32,29,28)(2,6)(3,8)(9,10)(11,12)(13,15)(14,16)(17,19)(18,24)(20,23)(21,29)(22,26)(25,28)(27,30)(31,32) involution — undirected(1,5,7,4)(2,8,6,3)(17,20,22,24)(18,19,23,26)(21,28,30,32)(25,27,31,29)(1,6,7,2)(3,4,8,5)(9,12)(10,14)(11,15)(13,16)(17,21)(18,25)(19,27)(20,28)(22,30)(23,31)(24,32)(26,29)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.