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