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