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)(17,18,23,20)(19,26,25,22)(21,24,31,28)(27,32,29,30)(1,3,6,7)(2,4,8,5)(9,10)(11,13)(12,14)(15,16)(17,19)(18,22)(20,26)(21,29)(23,25)(24,32)(27,31)(28,30)(1,2)(3,4)(5,7)(6,8)(18,20)(19,25)(24,28)(27,29) involution — undirected(1,4,6,5)(2,3,8,7)(17,20,23,18)(19,26,25,22)(21,24,31,28)(27,30,29,32)(17,21)(18,24)(19,27)(20,28)(22,30)(23,31)(25,29)(26,32) involution — undirected(1,5,6,4)(2,7,8,3)(9,11,12,15)(10,13,14,16)(17,22,23,26)(18,25,20,19)(21,30,31,32)(24,29,28,27)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.