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