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