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