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