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