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