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