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)(17,18,24,19)(20,22,26,23)(21,28,29,32)(25,31,27,30)(2,5)(6,8)(9,11)(10,13)(12,16)(14,15)(17,19,24,18)(20,23,26,22)(21,28,29,32)(25,31,27,30)(10,14)(11,16)(17,20,22,19,24,26,23,18)(21,28,30,27,29,32,31,25)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,21,22,30,24,29,23,31)(18,25,20,28,19,27,26,32)(2,5)(6,8)(10,14)(13,15)(21,29)(25,27)(28,32)(30,31) involution — undirectedA 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.