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