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