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