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