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