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