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