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