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