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