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