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