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