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