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