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