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