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