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