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