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