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