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