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