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