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