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