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