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