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