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