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)(27,34)(28,37)(29,31)(30,33)(32,36)(35,39)(38,40)(1,3)(2,6)(4,7)(5,8)(10,14)(11,19)(15,17)(20,22)(26,31)(27,35)(28,30)(32,39)(34,40)(36,38) involution — undirected(1,4,5,6)(2,3,7,8)(10,15)(13,21)(14,17)(16,24)(18,23)(20,22)(25,27)(26,32)(28,35)(29,36)(30,38)(31,34)(33,39)(37,40)(2,7)(3,8)(9,11,12,19)(10,16,14,23)(13,22,21,20)(15,24,17,18)(25,28,29,30)(26,33,31,37)(27,35,36,38)(32,39,34,40)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.