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