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