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