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