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