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