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