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