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