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