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