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