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