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