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