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