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