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