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