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