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