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