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