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)(11,15)(12,14)(13,16)(17,18,23,28)(19,24,31,40)(20,25,35,44)(21,26,22,27)(29,38,33,42)(30,39,36,45)(32,41,47,48)(34,43,37,46)(2,6)(7,8)(9,11,12,16)(10,13,14,15)(17,19)(18,24)(20,32)(21,30)(22,36)(23,31)(25,41)(26,39)(27,45)(28,40)(29,34)(33,37)(35,47)(38,43)(42,46)(44,48)(1,3,5,4)(2,7,6,8)(10,14)(11,16)(17,19)(18,24)(20,33)(21,36)(22,30)(23,31)(25,42)(26,45)(27,39)(28,40)(29,35)(32,37)(34,47)(38,44)(41,46)(43,48)(1,4,5,3)(2,8,6,7)(10,14)(13,15)(17,20)(18,25)(19,29)(21,34)(22,37)(23,35)(24,38)(26,43)(27,46)(28,44)(30,47)(31,33)(32,36)(39,48)(40,42)(41,45)(2,6)(7,8)(10,14)(13,15)(17,21,23,22)(18,26,28,27)(19,30,31,36)(20,34,35,37)(24,39,40,45)(25,43,44,46)(29,47,33,32)(38,48,42,41)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.