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