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