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