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