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