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