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