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