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