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