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