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