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