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