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)(11,15)(12,13)(14,16)(17,18)(19,25)(20,32)(21,37)(22,28)(23,39)(24,29)(26,35)(27,31)(30,42)(33,40)(34,44)(36,47)(38,41)(43,48)(45,46)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(17,19,24,31)(18,25,29,27)(20,33,36,48)(21,23,38,22)(26,42,44,46)(28,37,39,41)(30,34,45,35)(32,40,47,43)(1,3,5,4)(2,7,6,8)(10,13)(14,15)(17,20,23,35,24,36,22,34)(18,26,28,32,29,44,39,47)(19,30,21,33,31,45,38,48)(25,40,41,42,27,43,37,46)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,14,13,15)(17,21,23,31,24,38,22,19)(18,27,28,37,29,25,39,41)(20,33,35,45,36,48,34,30)(26,43,32,46,44,40,47,42)(1,4,5,3)(2,7,6,8)(17,22,24,23)(18,28,29,39)(19,21,31,38)(20,34,36,35)(25,37,27,41)(26,32,44,47)(30,33,45,48)(40,46,43,42)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.