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