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