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