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