One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,7,4,8)(9,10,13,16)(11,15,12,14)(17,18,22,26)(19,23,30,38)(20,24,33,41)(21,25,32,40)(27,35,44,47)(28,36,43,46)(29,37,34,42)(31,39,45,48)(2,6)(7,8)(9,11,13,12)(10,14,16,15)(17,19,22,30)(18,23,26,38)(20,27,33,44)(21,34,32,29)(24,35,41,47)(25,42,40,37)(28,45,43,31)(36,48,46,39)(1,3,5,4)(2,7,6,8)(9,12,13,11)(10,15,16,14)(19,27)(20,31)(21,32)(23,35)(24,39)(25,40)(28,29)(30,44)(33,45)(34,43)(36,37)(38,47)(41,48)(42,46)(1,4,5,3)(2,7,6,8)(10,16)(14,15)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.