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