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