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