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