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