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