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