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