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