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