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