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