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)(11,15)(12,19)(13,14)(16,20)(17,21)(18,24)(22,23)(25,26,31,33)(27,30,28,32)(29,34,37,40)(35,38,36,39)(1,2)(3,5)(4,6)(7,8)(11,17)(15,21)(18,23)(22,24)(25,27)(26,32)(28,31)(29,36)(30,33)(34,38)(35,37)(39,40) involution — undirected(10,14)(15,21)(16,19)(22,24)(26,33)(27,28)(29,37)(38,39) involution — undirected(1,3,4,7)(2,5,6,8)(9,10)(11,15)(12,16)(13,14)(17,21)(18,22)(19,20)(23,24)(25,28,31,27)(26,30,33,32)(29,36,37,35)(34,38,40,39)(9,11)(10,15)(12,18)(13,17)(14,21)(16,22)(19,24)(20,23)(25,29)(26,34)(27,35)(28,36)(30,38)(31,37)(32,39)(33,40) involution — undirected(9,12)(10,16)(11,18)(13,20)(14,19)(15,22)(17,23)(21,24)(25,30)(26,27)(28,33)(29,38)(31,32)(34,35)(36,40)(37,39) 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.