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