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