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