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