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