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