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