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