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