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)(25,26,30,27)(28,35,37,40)(29,34,39,32)(31,38,33,36)(2,5)(6,8)(10,16)(11,21)(18,19)(22,24)(25,27,30,26)(28,31,37,33)(29,34,39,32)(35,38,40,36)(1,3,4,7)(2,6,5,8)(9,11,13,21)(10,17,16,12)(14,24,15,22)(18,23,19,20)(25,28)(26,31)(27,33)(29,38)(30,37)(32,40)(34,35)(36,39)(9,12)(10,11)(13,17)(14,23)(15,20)(16,21)(18,22)(19,24)(29,39)(32,34)(35,40)(36,38) 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.