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