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