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