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