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