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