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