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