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