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