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