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