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