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