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