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