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