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