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