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