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