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