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