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