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