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