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