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