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