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