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