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