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