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