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