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