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