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