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