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