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