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