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