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