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