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