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