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