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