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