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