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