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