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