One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(10,13)(11,15)(17,18,22,25)(19,28,30,23)(20,32,34,42)(21,26,36,27)(24,40,43,35)(29,44,33,47)(31,39,46,38)(37,45,41,48)(1,3)(2,5)(4,7)(6,8)(9,10,12,13)(11,14,15,16)(17,19,22,30)(18,23,25,28)(20,33,34,29)(21,31,36,46)(24,41,43,37)(26,38,27,39)(32,44,42,47)(35,48,40,45)(2,6)(3,7)(10,13)(14,16)(17,20,21,35,22,34,36,40)(18,24,27,32,25,43,26,42)(19,29,31,45,30,33,46,48)(23,37,39,47,28,41,38,44)(9,11,12,15)(10,14,13,16)(18,25)(19,30)(20,34)(26,27)(31,46)(35,40)(37,41)(44,47)(3,7)(5,8)(17,21,22,36)(18,26,25,27)(19,31,30,46)(20,35,34,40)(23,38,28,39)(24,42,43,32)(29,45,33,48)(37,44,41,47)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.