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