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