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