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