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