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