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