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