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