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