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