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