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