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