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