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