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