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