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