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