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