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