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