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