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