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