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