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