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