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