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