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)(19,23)(20,21)(22,24)(25,26,31,36)(27,37,38,32)(28,34,29,33)(30,35,40,39)(1,2,5,6)(3,7,8,4)(10,14)(11,18)(16,21)(19,24)(25,27)(26,32)(28,35)(29,39)(30,34)(31,38)(33,40)(36,37)(2,6)(4,7)(12,20)(16,21)(19,24)(22,23)(25,28,31,29)(26,33,36,34)(27,35,38,39)(30,32,40,37)(2,6)(3,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,22)(20,24)(21,23)(25,27)(26,32)(28,35)(29,39)(30,34)(31,38)(33,40)(36,37) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,10)(11,17)(12,16)(13,14)(15,18)(19,23)(20,21)(22,24)(25,29,31,28)(26,34,36,33)(27,35,38,39)(30,32,40,37)(1,4)(2,3)(5,7)(6,8)(9,12,13,20)(10,16,14,21)(11,19,18,24)(15,22,17,23)(25,30,31,40)(26,35,36,39)(27,34,38,33)(28,37,29,32)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.