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