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