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