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