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