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