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