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