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