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)(11,18,20,15)(12,22,17,14)(19,24,23,21)(27,35)(28,29)(31,39)(33,34)(36,40)(37,38)(1,3,4,8)(2,5,6,7)(9,11)(10,15)(12,23)(13,20)(14,21)(16,18)(17,19)(22,24)(25,26,30,32)(27,36,38,39)(28,34,29,33)(31,35,40,37)(9,12,14,10,13,17,22,16)(11,19,21,18,20,23,24,15)(25,27,29,37,30,38,28,35)(26,31,34,36,32,40,33,39)(2,6)(5,7)(10,16)(11,20)(12,17)(21,24)(26,32)(31,40)(33,34)(36,39) 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.