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