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