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