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