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