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