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