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