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