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