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