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