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