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