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