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