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