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