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