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