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