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