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