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