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