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