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