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