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)(27,35,36,48)(28,32,39,46)(29,41,43,33)(31,42,44,38)(37,49,50,56)(40,53,52,47)(45,54,55,51)(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)(28,37)(29,42)(30,36)(32,45)(33,48)(34,44)(35,41)(38,43)(39,50)(40,54)(46,55)(47,56)(49,53)(51,52)(2,6)(5,8)(9,11,13,19)(10,14,16,17)(12,20,21,18)(15,23,24,22)(27,36)(31,44)(35,48)(37,50)(38,42)(45,55)(49,56)(51,54)(9,12,13,21)(10,15,16,24)(11,18,19,20)(14,22,17,23)(25,28)(26,32)(27,37)(29,40)(30,39)(31,45)(33,47)(34,46)(35,49)(36,50)(38,51)(41,53)(42,54)(43,52)(44,55)(48,56)(10,16)(14,17)(15,24)(22,23)(27,36)(28,39)(31,44)(32,46)(35,48)(38,42)(40,52)(47,53) 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.