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