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