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