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