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