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