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