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