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