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