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