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