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