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