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