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