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