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