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