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