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