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