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