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