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