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