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