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