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