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