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