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