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