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