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