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