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)(13,14,18,22)(15,19,16,20)(17,21,25,28)(23,26,24,27)(5,7,8,12)(6,9,10,11)(13,15)(14,19)(16,18)(17,23)(20,22)(21,26)(24,25)(27,28)(1,2,3,4)(15,23)(16,24)(17,25)(19,26)(20,27)(21,28)(13,16)(14,20)(15,18)(17,24)(19,22)(21,27)(23,25)(26,28) involution — undirected(15,23)(16,24)(17,25)(19,26)(20,27)(21,28) 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.