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