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