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