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