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