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