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