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