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