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