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