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