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