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