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