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