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