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