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