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