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