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