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