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