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)(25,26,31,35,30,34,43,48)(27,36,38,50,29,32,42,45)(28,33,41,47,40,46,53,55)(37,49,51,56,39,44,52,54)(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)(28,37,40,39)(31,38,43,42)(33,44,46,49)(35,45,48,50)(41,51,53,52)(47,54,55,56)(2,6)(3,7)(25,28,31,41,30,40,43,53)(26,33,35,47,34,46,48,55)(27,37,38,51,29,39,42,52)(32,44,45,54,36,49,50,56)(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)(28,39,40,37)(31,42,43,38)(33,44,46,49)(35,45,48,50)(41,52,53,51)(47,54,55,56)(10,16)(14,17)(15,24)(22,23)(27,29)(32,36)(37,39)(38,42)(44,49)(45,50)(51,52)(54,56) 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.