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