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