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