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