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