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