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