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