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