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