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