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