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