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