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