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