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