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