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