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)(23,27)(25,28) involution — undirected(2,4)(5,6,8,9)(7,11,12,10)(13,14,16,18)(15,17,19,20)(21,22,24,26)(23,25,27,28)(1,2)(3,4)(6,9)(10,11)(13,15,16,19)(14,17,18,20)(21,22)(23,25)(24,26)(27,28)(5,6)(7,10)(8,9)(11,12)(13,15)(14,17)(16,19)(18,20)(21,23)(22,25)(24,27)(26,28) involution — undirected(5,7,8,12)(6,10,9,11)(13,14)(15,17)(16,18)(19,20)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.