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