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