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