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)(27,33)(28,36)(30,37)(32,38)(34,39)(35,40)(1,2,4,5)(3,6,7,8)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(25,26)(27,30)(28,32)(29,31)(33,37)(34,35)(36,38)(39,40)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,27,28,33,29,35,36,40)(26,30,32,37,31,34,38,39)(2,5)(6,8)(12,20)(15,24)(17,19)(21,23)(25,26)(27,34)(28,32)(29,31)(30,35)(33,39)(36,38)(37,40) involution — undirected(1,3,4,7)(2,6,5,8)(10,16)(11,18)(15,24)(17,19)(26,31)(27,35)(32,38)(33,40)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.