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