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