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