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