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