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