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