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