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