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