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