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