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