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