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