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