One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,9)(8,12)(10,11)(14,17)(18,20) involution — undirected(5,7)(6,8)(9,11)(10,12)(13,14,16,17)(15,18,19,20)(2,4)(5,8,10,9)(6,7,11,12)(1,2)(3,4)(5,7)(6,8)(9,11)(10,12) involution — undirected(5,9,10,8)(6,7,11,12)(13,15,16,19)(14,18,17,20)(5,7)(6,9)(8,11)(10,12) involution — undirectedA 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.