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