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