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