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