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