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