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