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