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