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