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