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