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