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