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