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