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