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