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