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