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