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