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