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