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