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