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