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