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