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