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