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