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