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