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