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