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