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