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