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