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