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