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