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