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