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