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