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