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