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