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