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