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