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