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