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