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