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