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