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