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