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