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)(25,26,31,35)(27,34,29,32)(28,30,39,33)(36,38,37,40)(1,2)(3,7)(4,5)(6,8)(9,10,14,11)(12,17,19,15)(13,18,21,16)(20,22,24,23)(25,27,31,29)(26,32,35,34)(28,36,39,37)(30,40,33,38)(2,5)(6,7)(10,11)(12,19)(16,18)(20,24)(25,28,31,39)(26,33,35,30)(27,36,29,37)(32,38,34,40)(1,2)(3,6)(4,5)(7,8)(9,11,14,10)(12,17,19,15)(13,18,21,16)(20,23,24,22)(25,29,31,27)(26,34,35,32)(28,36,39,37)(30,40,33,38)(1,2)(3,6)(4,5)(7,8)(9,12,14,19)(10,15,11,17)(13,20,21,24)(16,22,18,23)(25,28)(26,30)(27,37)(29,36)(31,39)(32,38)(33,35)(34,40)(1,3)(2,6)(4,8)(5,7)(9,13)(10,16)(11,18)(12,20)(14,21)(15,22)(17,23)(19,24)(25,30)(26,28)(27,38)(29,40)(31,33)(32,37)(34,36)(35,39) 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.