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)(3,8)(4,6)(5,7)(9,11)(10,16)(12,23)(13,24)(14,19)(15,22)(17,21)(18,20)(25,26,31,32)(27,33,29,28)(30,34,38,39)(35,40,37,36)(1,3,5,4)(2,6,7,8)(10,17)(11,22)(12,19)(20,24)(25,27,31,29)(26,33,32,28)(30,35,38,37)(34,40,39,36)(9,12,15,19)(10,18,17,13)(11,23,22,14)(16,20,21,24)(25,28)(26,27)(29,32)(30,36)(31,33)(34,35)(37,39)(38,40)(1,4,5,3)(2,6,7,8)(9,13,15,18)(10,19,17,12)(11,20,22,24)(14,16,23,21)(25,29,31,27)(26,28,32,33)(30,35,38,37)(34,40,39,36)(1,2)(3,6)(4,8)(5,7)(9,14,15,23)(10,20,17,24)(11,19,22,12)(13,16,18,21)(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.