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