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