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