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