One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,12,13)(11,14,15,16)(17,18)(19,25)(20,35)(21,27)(22,28)(23,29)(24,30)(26,36)(31,47)(32,42)(33,43)(34,44)(37,46)(38,45)(39,41)(40,48)(1,3)(2,5)(4,8)(6,7)(17,19,23,34)(18,25,29,44)(20,22,36,38)(21,32,24,40)(26,45,35,28)(27,42,30,48)(31,37,39,33)(41,43,47,46)(10,13)(14,16)(17,20,21,37,23,36,24,33)(18,26,27,43,29,35,30,46)(19,31,40,38,34,39,32,22)(25,41,48,28,44,47,42,45)(2,6)(5,7)(17,21,23,24)(18,27,29,30)(19,32,34,40)(20,33,36,37)(22,31,38,39)(25,42,44,48)(26,46,35,43)(28,47,45,41)(3,8)(5,7)(9,11,12,15)(10,14,13,16)(17,22,21,31,23,38,24,39)(18,28,27,47,29,45,30,41)(19,33,40,20,34,37,32,36)(25,43,48,35,44,46,42,26)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.