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