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