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