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