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