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