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