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