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