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