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