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