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