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