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