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