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