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