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