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