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