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