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