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