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