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