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