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