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