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