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