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