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