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