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