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