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