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