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