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