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