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