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