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