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