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