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