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