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