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