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