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