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