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