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