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