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)(11,17)(12,22)(13,18)(14,23)(15,19)(16,20)(21,24)(25,26)(27,33)(28,31)(29,32)(30,35)(34,38)(36,40)(37,39) involution — undirected(1,3,5,4)(2,6,8,7)(9,11)(10,16)(12,15)(13,20)(14,21)(17,18)(19,24)(22,23)(25,27,29,35)(26,30,32,33)(28,36,37,34)(31,38,39,40)(1,3,5,4)(2,7,8,6)(9,12,15,20,13,21,14,11)(10,17,23,24,18,16,19,22)(25,28,29,37)(26,31,32,39)(27,34)(30,38)(33,40)(35,36)(1,4,5,3)(2,7,8,6)(10,18)(16,17)(19,23)(22,24)(26,32)(28,37)(30,33)(34,36)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.