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