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