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