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