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