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