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