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