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