One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,16)(11,17,19,14)(12,20,21,15)(18,22,24,23)(25,26)(27,32)(28,33)(29,45)(30,35)(31,36)(34,38)(37,46)(39,47)(40,48)(41,49)(42,50)(43,54)(44,51)(52,55)(53,56)(9,11)(10,14)(12,18)(13,19)(15,22)(16,17)(20,23)(21,24)(25,27,31,39)(26,32,36,47)(28,40,42,43)(29,41,38,30)(33,48,50,54)(34,35,45,49)(37,52,53,44)(46,55,56,51)(2,5)(6,8)(25,28,41,52,31,42,30,44)(26,33,49,55,36,50,35,51)(27,37,29,43,39,53,38,40)(32,46,45,54,47,56,34,48)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(28,42)(33,50)(37,53)(40,43)(44,52)(46,56)(48,54)(51,55)(1,3,4,7)(2,6,5,8)(11,19)(14,17)(18,24)(22,23)(25,29,30,27,31,38,41,39)(26,34,35,47,36,45,49,32)(28,43,44,37,42,40,52,53)(33,48,51,56,50,54,55,46)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.