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