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