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