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