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