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