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