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