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