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