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