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