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