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