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