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