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